Yep, Claireseptember, I can and do cook all that - Königsberger Klopse need capers, that's what gives them that sweet & sour flavour, same goes for the sour apple in Rotkohl (red cabbage). And not forgetting a couple of cloves and bay leaves.
Sauerbraten is also a favourite here - a joint of beef, post-roasted on the hob with red wine, cloves, bay leaves, garlic, slowly simmered until it virtually falls apart.
My own personal favourite is fresh cod fillet, pan-fried in real breadcrumbs (made from real bread) with Senfsoße, a quite sharp mustardy white sauce, similar to the Königsberger Klopse sauce .... I could swim in that !!!
God, but you've made me feel hungry now ... 